Adhesive material



-v1106. COMPoslTloNs,

COMING on PLASTIC.

Oct. 28. 1924.

R. H. SMITH ET As.

ADRES IVE MATERIAL Fi ed Jan. 15 1923 CGATING R PLASTIC.

Ptniellot. 2s, 1924.

UNITED STATES Exam PATENT oFFicE.

ROY H. SMITH, OF ST. PAUL, AND RALPH B. BEAL, 0F MINNEAPOLIS, MINNESOTA..

ADHES VE MATERIAL.

Appication filed January 13, 1923. e` l No. 612,499.

To all whom, it may concern.'

Be it known that we, ROY H. SMITH and RALPH B. BEAT., citizens of the United States. residing, respectively, at St. Paul and Minneapolis, in the counties of Ramsey and Hennepin and State of Minnesota, have invented certain new and useful Improvements in Adhesive Materials; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention provides a low cost but highly eiicient adhesive material especially adapted for use mg compo board from wooden slats and paper sheets, but adapted, nevertheless, for more general use.

The main and important elements of the adhesive material are sodium silicate,

and dolomite or other dolomitic limestone.

.The proportions may bvhiidblut we have obtained the best results by using sodium silicate solution and inelykpulveliZB-IMHolo- Orossg r.. calamities@ in .atm u *.v`. u l l proportions, measuredwin weight. Of course,

both `the"`s'diipsilicate and the dolomite may contain certain amounts of foreign materials, which, however, do not change the general character of the adhesive. Preferably, we use a pulverized dolomitic limestone known as dolomite.

Dolomite is a carbonate of alciu and ma nesium Ca.. fr 1n varying proport-ions an '1s oun 1n abundance 1n most the above types, gives the board stiffness and rigidity and long life or permanency.

IVe have further found that by the use of dolorn' or other dolomitic limestones, either fmm si y be employed a-nd a higher rade adhesive produced than in the use o any l hesive applied between the joints or contacting surfaces in a well known manner of constructing commercial compo board.

In Fig. 3, the composition board is made up of heavy paper facing sheets 8 and an interposed filler 9 of commingled sawdust and adhesive substance.

The composition board herein disclosed is made the subject-matter of an additional application Serial Number 688,188, filed of date January 24, 1924, and entitled Composition board.

What we claim is:

1. An adhesive composition consisting of a silicate of soda and pulverized dolomitic limestone.

2. An adhesive composition consist-ing of silicate of soda and pulverized dolomitic limestone containing carbonate of calcium andammggnmmfwmmingled p in a solution o approximately equal amounts of each measured in weight.

In testimony whereof we afiix our signatures.

ROY I-I. SMITH. RALPH B. BEAL. 

